Gas lighting and extinguishing apparatus.



D. CARTER.

' GAS LIGHTING AND EXTINGUISHiNG APPARATUS.

APPLICATION man JAN. 15. 1911.

1 ,272,33 1 Patented July 9, 1918.

2 SHEETS-SHEET 1.

s RSCOWPHUTOLIYNU.WASMINOTON n r D, CARTER.

GAS LIGHTING AND EXTINGUISHING APPARATUS.

A APPLICATION FILED JAN.1 5, 1917. T 7 1,2? ,331, Patentedu11ly9,1918.

2 SHEETSSHEET 2.

ms Nu/ews rrrsks qa Pnom-uma, WASHING run. my c.

i so

DANIELGAQiT-ER, oF-trononro, onramo, cANAnn, assre von or ens-HALE TO JAMES I p. B, MQNEIGE, or rononro, ONTABIQ, QANADA.

GAS I IIGHTING AND EXTIINGUISHING APPARATUS.

- Specification of Letterslatent.

Patented- Jul; 9, 1 918,,

A li a i n le ane a 2 s rial 42 4 3- To a l w om??? mm:

B i kn n, h I, DA EL Gas-we, a British subject, and resident ofthe city'of Tor n n t e unty f York PW- We of On a io, Der/ 1 1 fca ada, h n ent ain ne and usefu Impr nts n Ga L h ing a x ngu hi Appara s; d I her y es are hat h iollowingis a full, clear, and exact descript sm 9f he ame This invention relates to an appa t by hi h h eek of a asl gh fixtur m y be o e ed n l sed, d. the bjec f h n en i n is t so ce eet an l mess s appara u t at he a can be i ht d e d ext n u sh d t l and th lapse of time forthe entingnishing of the light predetermined, such as described in my application,"Serial No; 138,4;81, filed December 22nd, 1916'.

111 he a mies gure 1 i a s ct o a elevational view the application, showing dispos on f he P r when the tep-909 controlling the flow of gas to the burner of ese shtfixt re lesed- Figi a mila ew, sheiv ng the Posi ion o t parts when the stop-cock is open. Fig. 2 is ei' ienaloV e l ok n h Part esl h pposi es de to re 1 and F- 's s a nqd ea ie o e'f tr wtio how n. Fi s l and 2'. Fis- M a etai vi w of the PiimP- s? deta n of e r-che t F 1 a pe spe e iew f tl erat he shown inliisv Fi 7 is a pei's lectivej view of the actuator shown in Fig. :4. Fig 8 is a detail viewof the pawl, shown in Fig. Fig. 9 is a detail 'i'e f e i l po or the air y er, showing provided with a check valve, and 'F 10; is a de ail iew of th a u t n means for the stop cock.

The pipe Z), leading to the burner a, is fi t wi h th usu skin vor rotary t po k tr'e nst ef sas h ush th Pipe, the bu ne andit t e usui i l l 'pire' c a d pile ur r f r i n ting h sa fe the b r er a the iQP-Corik med as threu h t e casing z, 'andbeins P e i h 11 arm 9; by which it is '1 e "t r pecti y ope and clo e the pas h besh'the aspipef h pp d i ftlie'ga Pipe s t ebrae et h Oran an eyliii es is n sting of? yl nder i' ied'sfli s teller i rrlet ates an air inlet port, and, a hollow nipple Z f rm n an au Pa In gs 1, an 3,, the inlet port isshown to extend through the cylinder head j, and in Figs. 1 and 2 the exhaust port is shown to extend from the nipple 7c, and in ltig. 3 to extend through the side 01": the air cylinder adjacent to the cylinder head j, and in both cases, the exhaiist port is provided with an adjustable cap Z by which the escape of air through it may be regulated, but the location of the inlet and exhaust ports, and the means for the reg lation of the latter, may be varied withinthe scope of the Claims.

'W thin the air cy inde is a p n having'a piston rod m, passing through'the cylinder headj, and coiled on the piston rod m, between the piston m and the cylinder head j, is a spring a, to press" thepisto'n in the direction of. the cylinder head In the wall of the air cylinder, adjacent to the cylinder head j is a relief port 0, through which the air in the cylinder, between the piston and cylinder head j, may escape when the piston is moving, from its starting position adjacent to the cylinder head j, to the, completion of its stroke in the direction of the cylinder head j; and about the middle of the cylinder Wall is a relief port 0 to relieve the pressure in the air cylinder between the piston and cylinder heady, when its stroke in said direction is completed.

At the free end of the piston rod m is a slotted knuckle m by which the arm '9 is loosely connected with the piston rod, and connected with the arm 9 and With the burner is a spring 2), by which the arm is tensioned, to close "the valve and maintain it in its closed position when the piston rod is retracted Within the air cylinder.

Connectedivith the nipple 7c and with a hollow connection of the air chest q is an'air duct 9, and Within the air chest 9' is a spring'pressed valve 1", controlling the pa a e h ref o to valve?" normally closes the passage thr gh the hollow connection, and is opened by a plunger 1" so that the air within the air chest g may I pass through the air duct 9 to the air cylinder 2', and connectedwith the. air chest g ,'is an air pump t, by which ceinpressed air may be forced into h a Whe the plung i st esse *9 t the the air duct. "The I gchestand this air passes from the air chests into the duct 9 and ,air cylinder 2', and forces the piston m toward the cylinder head 9.

This movement ofthe piston compresses the.

. spring n and effects the outstroke of the pis- .tonvrod' m, which, through its knuckle con nection with the arm ,g turns the stopcock c to open the passage through the gas pipe to the burner.

The piston m, under the pressure the air inthe cylinder between it and the cylin *der'head j, moves to: the limit, of itsstroke in the direction of the cylinder head j, and when it passes the relief port 0' the compressed airin the cylinder between it and the cylinder head j begins to escape through the port 0 thus partly relieving the pressure 'on the piston. 7

When the operation of the air pump ceases, j'theplunger' 7" is released, and the valve'r, under the influence of its spring r,"then closes against its seat and shuts off communication between the air duct 9 andthe air chest, the compressed air in the air cylinden between the piston and the cylinder head j continuing to escape through the port 0 until the pressure on the piston and the *valve 1" is fully relieved. When this 'pressure is relieved,'the piston m automatically reverses its movement, under the influence of the spring n, and travels in the direction fof the piston head j, until it covers the relief port 0, when its further movement in that Zdireetionis resisted, either by the cre ation of the air check in the cylinder, be-

tween the piston and the cylinder head j, or by mechanical means hereinafter described, the spring 7, being of suflicient tension to hold the valve 1" closed againstits seat regardless of the pressure within the air cylinder, created either by the spring nor by thespringand air check.

During the reversal of'the movement of lthe piston to cover the relief port 0 the pis ton rod moves slightly inwardly into the cylinder, andto prevent the closing 01' partial 'closinggof the stop-cockc during such movement, the knuckle m'f is; formed with an elongated slot 6 to'contain the arm 9, 'thelength of this slot being suflicient' to allow for the movement of the piston to cover the relief port before move'ment'is imparted to the g and the stop-cock 0.1 l

InFig. 5 the air chest 9; is shown to be provided, with several hollow connections If for the ducts g of a corresponding numfixtures each connection be- 0 V I V v e 7 ngcontrolled by a spring pressed valve 1' faetuatedibyTa' plunger 2" and with a relief port a pommny closed by, valve 8', opened ibyap is r y op ni e alv the 'air pump maybe reversedwithout cre ating-suctionin the air chest, thus avoiding any possibility of such operation of the air pump disturbing any previously operated piston or pistons, the'adva'ntage ofthis con struction being'thatthe stop-cocks, of any or all of the lighting fixtures, may be selec tively opened and closed at will from a central station. 7

To close the stop-cook e, by the' action of the air pump, the plunge 1*"is operated to open the valve 1'," which has the immediate effect of eliminating theaireheckin the air cylinder, the, action"ofthefpump' then beingreversed to, exhaust the air from theduct land the air cylinder, and create suflicient suetiontherein to move thfe'rpiston toward the cylinder head rj, fthis suction being as .sisted by the spring 'n, which pressesthe p sftonmin the direction of'thej cylmderhead 17', until the piston completes its movement in that direction. This causesthe'instroke .of the piston rod and brings the knuckle m .into operative relation with the arm 9 for the closing movementof the stop cock,

this closing movcme'nt'of'the,stopscoek being assured by thespring p,.which not only to the knuckle slot Z).;

but also assists its closing movementowing In Fig. 3, the piston rod m is shownto be provided with a loosely fittedcollar u,

:slidable axially ofthe piston, rod, and connected with theoollar uis' an actuator, com

' mg movementof the detent plated) in adirection from and toward-the cylinder head jj and adj ustably secured .to the detent plate rising a crank arm a, one-member of'which' extends horizontally across the cylinder fmaintains" the valve in its closed position,

Lo 1s a catch tv 'to be engaged bylthe detent/a. u V I The crank arm 2d 15 connectedby a spring '11) to some conveni'ent or appropriate part ."of the air'fcylinder i, the purpose of the sprlngb'eing to normally'hold the arm and collar ina retracted position, and, attached to the. crank arm a? is a pull chain by 7 fwhiclrthe crank army and collar it may be drawn downward. During the downward jmove-ment. of these parts the collar ztr'engages the knuckle m and causesthe downward I or outstroke movement of the piston roam with it, until the piston m is arrested by the 1 contraction of'the spring a, the piston rodm being 'provided'with Lacatch a), to. engage the detent plate 23' "and securely hold the pisiton' rod in its outstroke position when the ri n? h wer ave s e ef p r j q il he are is d e d fr m hei c.-

ing -towa' 'fd t'he cylinder head j, mar it covers the relief port; 0. During the OIi-iStlOk'Of the piston rod m" the stop maclc 0' istu'rned, by the engagement of the knuckle m with the arm 9, to opent'h'e passage through the gas pipe b" t'o' the burner 1/, and isheld open while the pistoii rod m rem-(lineal;-thenniit of its'ciitst'roliei The'ga-s then flows-through the gas pipeto the burner and'is' ignited by the light from thepi'lbt biirne-r and continues learning while thest-op 'coclt remainsop'eii; When it 1s desired'to close the stopcock threhgh the-agenc ofthe; pal-1 lain 0), the

latter is drawn-downward, mail the detent u"? engagesthe catch w, bendsthe detent plate 13' into a sli htlyinclined position, thnsreleasing the detent plate: froin the catclf :20 so" that the pisten' rod will be free to start its instroke action, under tl'i-e infin nce cf the spring when the strain on the pull chain is released, the collar u and the crank arni u then returning under the influence of the spring w" to their normal position! I The instroke' of the piston rod is cheated by the pressnr'e' of the springn against the piston m, but the action of this s nin-g is resisted by the air check between the piston and the cylinderliead j intilthe air form'- ing the eheck is forced out through theexhaust port Z. hen the air pump tis einploy-ea to cause the outstroke as the piston red, the latter freely slides throi lgh the col lai a, which, during such movement, remains in" its nonnalposition; When the piston rod isfat the limit of its oiitstrolie; the'eat-ch :10" engages, as ii'ithe forrner case, withthe detent plate a), andis held,- by such engageinent, in 'its ontstroke position until it is released either through the agency ofthepull chain'- or by the operation of the air pump 25: In th hatter -ca'se, the plunger- 1* is pressed to open the valvefr, and thus relieve the air check in the cylinderand the air pump 5 is then reversed to create suiticient suction iii' the air duct and cylinder tb-draw the piston in the direction of the cylinder head j; thus disengaging"the catch from the detent plate, the catch being so romedthat it will p'erh lit of siichldisengageihe/liti In Figs. 1 and 2 the seep-aeolian ex aened -beyendtethsides of the 'casing f,

secilre'd to it, in additionto the arm 9, isia ratchetwheel y, having a ratchet tooth y. The ratchet wheel turnswith the'stopcoclgand fastened to the casing f is a spring pawl 3 which engages with the tooth 3/ and prevents the reverse rotation of the ratchet" wheel and the stop-cock, while the spring pawl y is so engaged with the ratchet tootln'thus holding the'sto'p-cock in its openposition. To n'ia'nually release the spring pawl y from the ratchet tooth 3 the stem c of the stop-cock is extended beyond the ratchet wheel, and loosely 'inounted thereon is a hub 2 rotatable independently of, and movable laterally toward and away from, the ratchet wheel; thehub 2 having a leverarin2 by which the stop-cock may be manually actuated and an offset 2 nor mally engaging the pawl 3/ and in contact therewith by a' tension spring a, which presses the hub 2' into' contact with the ratchet wheel 3 The operation of the air pump t causes the oii'tstroke' movement of the piston rod and the tririiiiig of the stop-cock 0 to open the'passage throt'i'g'h" the pipe Z2 to'the burner as above described, and as the ratchet wheel 3 turns in unison with the stop-cock, this will bring" the ratchet tooth 1/ into engagement with the spring pawl 3 to hold the'valve open but no corresponding movement of the l'ever'2' and hub- 2 will occur as the lever is maintained in its normal position by the tension spring a, which is so arranged as to not only press it against the ratchet wheel but also to hold it inoperative asshown' in full lines in Fig. i with the offset 2" in contact with the pawl 3/.

The engagement of the ratchet tooth y with the pawl 3 holds the piston and rod in their on-tstroke position, and the stopcock open,-1n1ti1 the pawl y is released from the ratchet tooth. The release of the pawl 3 from the ratchet tooth 3 may be effected either by a pull chain, connected with the lever 22 or by the reverse operation of the air pu'nrp as above described.- In the case of the pull chain, the level" 2 and hub 2 are turned until the ofiset2 comes into contact with the pawl y" and presses it away from the ratchet t'ooth 2 the piston rod and piston, under the influence ofthe spring N then being free to move in the direction of the cylinder head j, and close the stop- 'inoven'ient, under the influence of the tension spring, the-engagement of the offset ivith-thi's incline'dside will p'ress'the-hiib' 2 laterallyfmm the ratchet wheel a-nidlenable the oifset to clear the pawl y on the. completion of its returnmovement. 1When the olfest clears the, pawl, the tension spring a presses the hub 2 again into contact with the ratchet wheel and brings the offset 2" again into operative relation with the pawl.

'Vvhen it is desired to manually open the stop-cock, c, the lever is turned by the pull chain a: from the position shown in full lines in Fig. 1? to the position shown in dotted lines in the same figure. I This turning movement of the lever and hub brings a cluch members on the hub a into engagement with a clutch member 6 on the ratchet wheel 3 causing the turning movement of the ratchet wheel and stop-cock, in unison with that of the hub 2, until the stop-cock is fully opened, the ratchet tooth y then beingengaged by the pawl y. The turning of the stop-cock moves with it: the arm g,

which operating in the slotted knuckle mi draws the piston rod to the limitof its outstroke, and the piston to the limitof its movement in the direction ofthe cylinder head j, asabove described. When the strain on the pull chainw is released, the lever z and hub a return to their normal position,

I under the influence of the tension spring a,

' offset f against which the ratchet. tooth fej ad 'jfl bring the. slotted knuckle m .into engagement with v the arm 5 d i the as previously described in connection with the closing of the stop-cock. When the pull chain is operated to releasethe pawl for the instroke of the piston red, the spring n, presses the piston toward the cylinderhead j, the action of the spring being resisted by the air check within the air cylinder. This air check; owing to the exhaustv port being regulable through the, adjustment of the cap Z, or other equivalent mechanical means,

will predetermine the length of time required for the closing movement of the stopcock. Thus it is possible for a person desiring to extinguish thelight by the pull chain to leave the premises before the illumination ceases. I

The detent pawl y is formed with an engages when the stop-cock is open, the offset f being slightly inclined outwardly from the tooth, and the tension ofthe detent pawl y being suilicientto continually engage the ratchet tooth y andhold the stop-cock open untilreleiased from; the ratchet tooth,- either manually, by. the use of the pullchain as 7 above described, or through the action of the air pump. When the air pump isemployed to release the ratchet tooth from the pawl 9 its action is reversed when the plunger 7' has been pressed to open the, valve 4", the

pressure of the air check in the air cylinder then. being relieved and a suflicient suction created in the air'jduct and cylinder to draw the piston in the direction of the cylinder this suction applyingsufiicient force to the arm 9 and stop-cock to cause the ratchet tooth, by its engagement with the inclined offset f, to spring the pawl y free from engagement with it.

Should it be desired to dispense with the use of the air pump and the air duct forthe operation of the apparatus and to rely solely upon the use of the pull chain for the actuation of the parts, the inlet port is: will, in that case, be provided with a checkvalve 7a, which will permit of the admission ofair through the inlet port to the air cylinder and prevent itsescape therefrom. 4 In the use of the apparatusthe gas at the burnerof the gas light. fixture canbe instantly ignited and extinguished from any station withwhich the air duct of such gas light fixture is connected, thus rendering it possible to control-the illumination furnished bythegas light fixture at"; any distance therefrom. When an actuator such as the pull chain and ratchet arrangement, shownin Figs. 1 and 2, or the pull chain, crank arm, detent plate, and detent, shown inrF-ig. 3. is employed to turn the stop-cock the gas canbe manually ignited and extinguished by thev operation of suchactuator,

and, th air check in the air cylinder, the escape of which is regulable through the exhaust port, will determine the length of time" with its inlet, exhaust and relief ports, and i the spring pressed piston and rod constitute an aircheck controlling the action of the stop-cock; that the airpump with its .air duct, whether employed independently of, when used with a single gas light fixture, or, in, conjunction with; an air chest Qhaving valve controlled connections for-several; gas

light fixtures, constitute. aipenumatic actuator for the. air check; that the spr ng tensioned. ratchet and lever'mechanism shown in Figs. 1;and,2 or thespring tensioned crank arm andcollar shown in Fig. 3, constitute a, mechanical actuator. for the air.check; and

that theair, check maybeioperated byeither V the pneumatic or mechanioalflactuator, and that such operation 7 of the aircheck may be reversed. at will bythe other actuator,;and

from 'theforegoing description it, will also f:

be ascertained that the-details of the eonstruction. and operation of the parts may ,be varied within the scope of the claims with.- out. departing from the essential principles .of the-inventions.

'; Hav ngthus'fully described 'what I claim as new and desire toisecureby LettersPatent, V1 1.- In gas l ghting and extinguishing;

tarasa' ene ate remain n a gas tu n and a top-s scr wing t f w ofjg th r t the 'cpmbiaaa n of an air check controlling the movement of C the stop-cock, a detent to hold the stop-cock open, and means actuated by the aircheckto render the detent inoperative by a partial actuation when the Stop-cockds opened.

2. In a gas lighting and extinguishing apparatus, comprising a'gas burner, and, a stop-cock governing the flow ofgas thereto, the combination of an-air'check, controlling the movement of the stopcock, a detentto'hold the stop-cock open, and a mechanical actuator to open the stop-cock and release, the detent for the closing action of the stopcock.

3. In a gas lighting and extinguishing apparatus, compri ing a gas burner, and a stopcock, go,verning the flow of gas thereto, vthe combinatioirof an air check, controlling the movement of the stop-cock, and a me'clianical actuator to open the stop-cock and cause the operation of the air check, said air' check comprising an air cylinder having'inlet, exhaust, and relief ports, a piston movable within the air cylinder, and a piston rod for thepiston connected with the stop-cock.

4:} In a gaslighting and extinguishing apparatus, -;comprising a as burner, and, a stop-cock governing theid ow of gas thereto, the combination of an air check, controlling the movement of the stop-cock, and aT inechanical actuator to open the stop cock and causef the operationbf the air check, saidhir check comprising an air cylinder having inlet, exhaust and relief ports, a piston movable" within. the air cylinder, a piston rod for the piston, connected with the stop-cock, and a spring actuating the iston. during thec 'osiiig of t s p c c 5. In a gaslightillgand extinguishing apparatus, comprisinga 'gas'burner, and, a stop-cock governing theffiow of; gas thereto, the combination of an air check con trolling the movement of the stop-cock, and an actuator to open the stop-cock and cause the operation of the air check, said air check comprising an air cylinder having a valve-controlled inlet port, a regulable exhaust port, and a relief port, a piston movable within the air cylinder, and a piston rod for the piston connected with the stopcock.

6. In a gas lighting and extinguishing apparatus, comprising a gas burner, and, a stop-cock governing the flow of gas thereto, the combination of an air check, controlling the movement of the stop-cock, and a mechanical actuator to open the stopcock and cause the operation of the air check,' said air check comprising an air cylinder having inlet, relief, and regulable exhaust ports, a spring-pressed piston movable within the air cylinder, and a piston ma" for the piston connected with the stopcock.

.7. In a gas lighting and extinguishing apparatus, comprising a gas burner, and, a stop-cock having an arm governing the flow of gas thereto, the combination of an air check, controlling the movement of the stop-cock, and a mechanical actuator to open the stop-cock and cause the operation of thefair check, said air check comprising an air cylinder havinga valve-controlled inlet port, a relief port, and a. regulable exhaust port, a spring-pressed piston movable within the air cylinder, and a piston rod-for the piston having a slotted knuckle in whichiscontained the arm of the stopock '8. In a gas lighting and extinguishing apparatus,including a gasburneijaspringtensioned stop-cock governing the flow of gas thereto,*andan actuating arm for the stop-cock by which it is turned to govern thejflow of gas to the gas burner, the combination 'of'an air check, comprising an air cylinder, a piston movable therein, a piston rod for the piston actuating-said arm, and means moving the piston to effect the actuation of the arm, said cylinder having inlet and relief ports.

9.,111 a gas lighting and extinguishing apparatus, comprising a' gas burner, a spring tensioned stop cock governing the flow of gas to said burner, and an arm for said'stopcock, the combination of an air check controlling the movement of the stopcock, a mechanical actuator to open the stop cock and cause the operation of the air check, saidfair check comprising an air cylinder, having avalv e-controlled inlet port, a relief port, and a regulable' exhaust port, a spring-pressed piston movable within the air cylinder, and a piston rodrfor the pis ton, having a slotted knuckle in which is contained the arm of the stop-cock.

10.- In a gas lighting and extinguishing apparatus, -'comprising a gas burner, and a stop-cock governing the flow of gas thereto, the combination of an air check controlling the movement of the stop-cock, and a me chanical actuator to open the stop cock and cause the operation of the air check, said actuator comprising a ratchet turnable with the stop-cock, a spring pawl engaging the ratchet when the stop-cock is turned to open position to resist the closing movement thereof, and means for turning the stopcock to open position and for releasing the pawl from engagement with the ratchet for the closing of the stop-cock.

11. In a gas lighting and extinguishing apparatus, comprising a gas burner, and a spring-tensioned stop-cock governing the flow of gas thereto, the combination of an air check, controlling the movement of the stop-cock, and a mechanical actuator to open the stop-cock and cause the operation of the air check, the said actuator comprising a ratchet turnable with the stop-cock, a spring pawl engaging the ratchet when the stopcock is turned to openposition, to resist the closing movement thereof, and means forming part of the actuator for releasing the pawl from engagement with the ratchet for the closing of the stop-cock.

12. In a gas lighting and extinguishing apparatus, comprisingL a gas burner, and a stop-cock governing t e flow of gas thereto, the combination of an air check controlling the movement of the stop-cock, and a mechanical actuator to open the stop-cock and cause the operation of the air check, said actuator comprising a ratchet turnable with the stop-cock, a spring pawl engaging the ratchet when the stopcock is turned to open position to resist the closing movement thereof, a spring-tensioned rockable lever, having, a member engaging with-the pawl to disengage it from the ratchet for the closing of the stop-cock, and means forming part ofthe lever engaging the ratchet to turn the stop-cock to open position.

13. In a gas lighting and extinguishing apparatus, comprising a gas; burner, and a spring-tensioned stop-cock governing the flow of'gas thereto, the combination of an air check, controlling the movement of the stop-cock, and a mechanical actuator to open the stop-cock and cause the operation of the air check, said actuator comprising a ratchet turnable with the stop-cock, a spring pawl engaging the ratchet when the stop-cock is turned to open position to resist the closing movement thereof, a spring-tensioned rockable lever, having-a member engaging with the pawl to disengage it from the ratchet for the closing of the stop-cock, and means forming part of the lever engaging the ratchet to turn the stop-cock to open position.

Copies of this patent may be obtained for 14; Ina gag lighting that extinguishing" apparatus comprising a gas burner, and a stop-cock governing the fiow'of gas thereto,

the combination of an air check, controlling the movement of the stop-cock, and a mechanical actuator toopen the-stop-cock and cause the operation of the air check, said air check comprising an air cylinder having inlet,-exhaust and relief ports, a piston movable within the air cylinder and a piston rod for the piston connected with the stop cock, said'actuator comprising a ratchet turnable with the stop-cook, a spring pawl for the closing of the stop-cock, and means forming part of the lever engaging the ratchet to turn the stop-cockto open posi tion. 1

15. In a gas lighting and extinguishing apparatus, comprising a gas burner, and a spring-tensioned stop-cock governing the flow of gas thereto, the combination of an air check, controlling the movement of the stopcock, and a mechanical actuator to open the stop-cock and cause the operation of the air check, said actuator comprising a ratchet turnable with the stop-cock, aspring pawl engaging the ratchet-when thestop-cock is turned to open positionto resist the closing movement thereof, aspring-tensioned rock ablelever having a member engaging with,

the pawl todisengage it from the ratchet for the closing of the stop-cock, and a clutch.

forming part of the lever engaging the ratchet to turn the stop-cockto. openrposi- Toronto,"December fifth, 1916s a 1 'DA'NIEL CARTER Signed in the presence of v I ELsm WHITEHEAD, r a CHAS. H. RUSH-f1 five cents each, by addressing the (fiommissionerof Eatents, Washington, D. G. 7 

